Envelop.



mi. 680,368. P atented Aug. 13, I901. w. P. SHATTUCK.

E N V E L 0 P (Application filed Aug. 13,- 1900.)

(No Model.) 2 Sheets-Sheet 2.

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UNITED STATES PATENT @FFIQE.

\VILLIAM P. SIIATTUCK, OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO THESHATTUCK MANUFACTURING COMPANY, OF SAME PLACE.

ENVELOP.

SPEGIFICA'IIOH formingpart of Letters Patent No. 680,368, dated August13, 1901 Application filed August 13, 1900. Serial No. 261736. (Nomodel.)

To all whom, it may concern.-

Be it known that I,WILL1AM P. SHATTUCK, of the city of Minneapolis,county of I'Iennepin, State of Minnesota, have invented cer- 5 tain newand useful Improvements in Envelops, of which the following is aspecification.

This invention relates to improvements in envelops, and particularly toenvelops designed for use in mailing third and fourth class mail-matter.

The object I have in view is to provide an envelop of this class that iscapable of being readily opened for the purpose of inspecting thecontents, thatzis strong and durable, and hence capable ofbeing used formailing heavy articles, and that shall when closed be perfectly tight,and thus prevent the loss of the material therefrom.

The invention consists generally in an envelop provided at its meetingedges with double flaps, one pasted to the inside of one wall of theenvelop and the other pasted to the outside of the opposite wall.

The invention consists, further, in the constructions and combinationshereinafter described, and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure1 is a side elevation of an envelop embodying my invention. Fig. 2 is ahorizontal section of the same on the line a; of Fig. 1. Fig. 3 is avertical section on the line y y of Fig. 1. Fig. 4 is a view'of theenvelop-blank, showing one of the edges partially turned over to formthe double flap at that edge of the envelop. Fig. 5 is a perspectiveView of the blank partially folded. Fig. 6 is a-partial perspective viewof the same, showing the parts in another position. Fig. 7 is a rearelevation of the envelop as it appears just before the side flaps arefastened. Fig. 8 is a perspective detail of the metal closing orfastening strip. Fig. 9 is a top view of the completed envelop as itappears when closed.

The envelop is formed of the rectangular blank 2, which is scored on thelines ct b to form the side flaps 4: and 5, on the line 0 d to form thecentral or bottom fold, and on the lines e f to form the folds whichpermit the side flaps to be arranged one upon the inside and the otherupon the outside of the envelop. The blank is also preferably cut on thelines ma between the ends of the side flaps and the closing part. Theblank being cut and scored on the lines indicated, it is then folded onthe line 0 d and on the lines ef, asshown in Figs. 5 and 6 of thedrawings. The outer surface of one side flap is then pasted to the innersurface of the opposite body part of the envelop, and the inner surfaceof the other side flap at the same side of the envelop is pasted on theouter surface of the opposite body part of the envelop. The folds on thelines efpermit the arrangement of one of the flaps upon the insideitndthe other upon the outside of the envelop, as illustrated by Figs. 5and'6 of the drawings. This provides a double flap at each side of theenvelop, one flap connecting one body part to the opposite body partonthe inside of the envelop and the other flap similarly connecting thebody parts upon the outside of the envelop.

The particular feature of my invention is the solid corner furnished forthe envelop by each of the foldsfef. It will be noted that the envelopis not cut or punctured at these points. Instead the paper is folded insuch a manner that the slack furnishes two strengthening angles or foldsat each corner of the bottom of the envelop. These small folds f areglued or pasted, so that when the folds are pressed together the threesurfaces f will stick to the folds 4 and 5 and the front or upper halfof the envelop, making a very solid, strong, and perfectly tight corner,which will be stronger than any other part of the envelop. At the sametime the envelop opens square at the bottom-that is, the corners are notfilled, beveled, or cut off.

Another feature of my invention is the double strength of the edges ofthe envelop, due to the two pasted folds at each side.

It will be noted that the blank from which the envelop is made isrectangular, there being absolutely no waste in making the envelop. Thetop 2 of the envelop projects beyond the edges of the envelop after thesame I00 has been completed, so that when the envelop is to be sealedthe top 2 may be first folded down over the rear or back of the envelop,after which the projecting ends 2 may be folded around and stuck uponthe face of the envelop. The particular object, however, of the wide topor flap 2 is to afford the necessary paper to completely cover asoft-metal strip that is rolled therein, and every part of which may bethus covered with paper, as required by the postal regula tions. Whileany suitable device may be employed for closing the envelop, this metalstrip is best adapted for envelops intended for third and fourth classmail-matter, and, as shown in the drawings, this strip 3 is a U-shapedsingle strip of sheet metal, which is placed across the end of the blankand secured thereto by folding, pressing, or clamping the U-strip ofmetal upon the edge of the fold 2. The metal strip is as long as thefold is Wide and remains bare until the fold is rolled preparatory tosealing the envelop. When it is desired to seal or close the envelop,the strip is rolled into the fold or flap 2, (see transverse dottedlines, Fig. 4,) and when thus rolled the strip will be entirely coveredwith paper. The strip is rolled down so that it takes in a part of therear body part of the envelop, and the ends of the strip are then bentand folded around onto the front body part of the envelop. By thissimple construction Iam able to providea metalclose'd envelop with allthe parts of the metal covered with paper in conformity with the postalregulations, and the requirement for a separate paper cover for themetal strip is obviated. It is a well-known fact that the cost of theclosure-strip and of attaching the same to the envelop has heretoforeequaled the costof the envelop taken by itself, and it is also awell-known fact that the paper covers of the strips as heretofore usedhave been very apt to get loose and render the envelop unfit for use.This difficulty is entirely overcome in my invention by the covering ofthe metal strips with the flap or fold of the envelop in the same piecewith the envelop and with the same material as that from which theenvelop is made.

In addition to the advantage gained by the great reduction in the costof my envelop as compared with others my envelop may be made from anypaper-stock desired, and the envelops may be made from tissue-paper,adapting the same for many new uses by reason of the fact that as theblank is not cut at the corners the envelop made therefrom is not apt totear or open and also because of the double sticking or pasting of thesides of the envelop.

Several modifications of my invention will readily suggest themselves tothose skilled in the art, and I do not confine myself to the specificconstruction herein shown and described.

In the drawings the envelop is shown to be rectangular in shape, and itis so described in the foregoing specification, and the same termrectangular will be employed in the claims; but as so employed it isintended to include and cover an envelop-blank and envelop of any othershape, as it is evident that the peculiar corner-fold of my inventionadmits of the manufaetureof envelops of many different shapes. Ifdesired, several corner-folds may be provided on each side of theenvelop, so that the envelop may take the form of any regular orirregular polygon or other geometrical outline.

Having thus described my invention, I claim as new and desire to secureby Letters Patent 1. An envelop formed from a rectangular blank foldedonce upon itself to provide two body parts, said blank being providedthroughout the length of the body parts with continuous uncut side flapsor folds, having the triangular folds f,f', and one part of each sideflap being secured to the inside of the opposite body part, and theother part of each side flap being secured to the other side of the bodypart, substantially as described.

2. An envelop formed from a rectangular blank folded once upon itself toprovide two body parts, said blank being provided throughout the lengthof the body parts with continuous uncut side flaps or folds having thetriangular folds f f, one part of each side flap being secured to theinside of the opposite body part, and the other part of each side flapbeing secured to the other side of the body part, and the upwardly andlaterally projecting top flap 2, substantially as described.

3. An envelop formed from a rectangular blank folded once upon itself toprovide two body parts, said blank being provided throughout the lengthof the body parts with continuous uncut side flaps or folds having thetriangular folds f f, one part of each side flap being secured to theinside of the opposite body part, and the other part of each side flapbeing secured to the other side of the body part, the top envelop-flap2, and the U-shaped metal strip clasped upon the top edge of said flap2, said strip being of less width than said. flap, and adapted to berolled and covered therein and thereby to close the envelop,substantially as described.

4:. The envelop provided with an upwardly and laterally projecting topflap, in combination with the U shaped strip of metal clasped .upon thetop edge of said flap, said strip being of less width than said fiap andadapted to be rolled in and covered by said flap, and the ends of saidmetal strip being adapted to be bent around the sides of the envelop, asand for the purposespecified.

In witness of the foregoing I have hereunto subscribed my name, this 1stday of August,

1900, in the presence of two witnesses.

WILLIAM P. SHATTUOK. In presence of- O. G. HAWLEY, A. 0. PAUL.

TIO

